Patents by Inventor Andre R. Von Wattenwyl

Andre R. Von Wattenwyl has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Natural dyestuffs for gelatine capsules
    Patent number: 4268265
    Abstract: Process for stabilizing dyestuffs sensitive to light and/or oxidation, especially natural dyestuffs, by adsorption on a highly disperse adsorbent, whereby the dyestuff is immobilized, as well as the application of the process to dyestuffs which are determined for dyeing medicines, for instance gelatine capsules for medicinal purposes, cosmetics, food stuffs and animal feed.
    Type: Grant
    Filed: July 13, 1979
    Date of Patent: May 19, 1981
    Assignee: Parke, Davis & Company
    Inventor: Andre R. Von Wattenwyl